Passive opening and closing type single-pipe net basket, umbrella sheath and manufacturing method

Abstract

The invention discloses a passive opening and closing type single-pipe net basket, an umbrella sheath and a manufacturing method, the single-pipe net basket comprises a net basket pipe body, a net part and a net basket end, the net part is connected with the net basket pipe body and formed by a plurality of memory alloy wires, one ends of the memory alloy wires are converged to form the net basket end, and the net basket pipe body is provided with an axial hollow channel; the hollow channel is used for introducing a medical device capable of being pulled and inserted so as to reach or leave the area where the net part is located; and the long core rod is used for propping against the end head of the net basket so as to fold the net part. According to the passive opening and closing type single-pipe net basket, the structural form is improved, a single-pipe net basket structure can be obtained, the passive opening and closing type single-pipe net basket does not need to be matched with an outer pipe during use, can be independently used, and can also be matched with a pipe lens, a sheathing canal and the like for use to complete some object taking operations. And the overall structure is simple, and the strength and the flexibility are good.

Description

Technical Field

[0001] The present invention relates to the technical field of medical device production, and in particular to a passive opening and closing single-tube mesh basket, an umbrella sheath and a manufacturing method thereof. Background Art

[0002] A mesh basket is a common medical device, widely used for removing stones and objects from within the human body. One end of the basket typically features a mesh structure, with wires threaded through an outer tube and connected to an external handle. Pulling the wires allows the mesh to enter or exit the outer tube, closing or opening the basket. This type of basket typically requires an outer tube for the wires to pass through, which increases the basket's outer diameter and prevents the basket from providing access for external instruments. Summary of the Invention

[0003] The purpose of the present invention is to provide a passive opening and closing single-tube net basket, an umbrella sheath and a manufacturing method to address the problems existing in the prior art.

[0004] To achieve the above object, the technical solution adopted by the present invention is: In one aspect, a passively openable single-tube basket is provided, comprising a basket body, a mesh portion formed by a plurality of memory alloy wires connected to the basket body, and a basket end formed by converging one end of the plurality of memory alloy wires, wherein the other ends of the plurality of memory alloy wires extend and flow to form the basket body, the basket body having an axial hollow passage; the hollow passage is used to allow a removable medical device to pass through to reach or exit the area where the mesh portion is located; It also includes a long core rod, which is arranged in the hollow channel in a push-pull manner and is used to support the end of the net basket to make the net part collapse.

[0005] By improving its structural form, this passive opening and closing single-tube basket can obtain a single-tube basket structure that does not require the cooperation of an outer tube during use. It can be used independently or in conjunction with a tube mirror, sheath tube, etc. to perform some retrieval operations. In addition, the overall structure is simple and has good strength and flexibility.

[0006] Furthermore, the inner wall of the basket tube body is provided with a super-slip coating, which is conducive to the pushing and pulling movement of the basket tube body, and also facilitates the insertion and movement of instruments such as electrode wires, laser optical fibers, and biopsy forceps.

[0007] Furthermore, one end of the long core rod is provided with an arc-shaped head, and the other end of the long core rod is provided with a locking mechanism that is detachably connected to the basket tube body. When the locking mechanism is connected to the basket tube body, the head presses against the end of the basket and tightens and closes the net to a size that does not exceed the outer diameter of the basket tube body.

[0008] The locking mechanism is arranged so that the long core rod can be inserted into place and the net portion can be folded to lock with the end of the basket tube body, and the two will no longer slide relative to each other, thus facilitating the insertion and withdrawal of the entire basket.

[0009] Furthermore, the locking mechanism is an end cap arranged at the end of the long core rod, the opening of the end cap is facing the length extension direction of the long core rod, the inner periphery of the opening of the end cap is provided with an internal thread, and the outer periphery of the end of the basket tube body is provided with an external thread that cooperates with the internal thread. This threaded cooperation is both convenient to use and convenient to manufacture.

[0010] A method for manufacturing a passive opening and closing single-tube basket, comprising the following steps: Taking a plurality of memory alloy wires, placing the front sections of the plurality of memory alloy wires in a mesh structure on a shaping die, and winding or braiding the middle and rear sections of the plurality of memory alloy wires in parallel on a core rod behind the shaping die, and obtaining the mesh portion and a mesh tube wound or braided with the memory alloy wires after shaping; The mesh tube wound or woven with memory alloy wires is subjected to polymer material thermal transformation to form the tubular basket body, and multiple memory alloy wires are left with 2 to 4 mm at the front end of the basket mold as a basket end, and a coaxial hydrophilic head or loach head is connected in front of the basket end; An external thread is processed at the end of the basket tube body; a long core rod with an end cap is processed and manufactured according to the length of the basket tube body and the opening and closing size of the net part, and an internal thread matching the external thread is processed on the inner periphery of the end cap.

[0011] On the other hand, a passive opening and closing umbrella sheath is provided, comprising an umbrella sheath tube body, wherein an end ring is provided at the end of the umbrella sheath tube body, and an umbrella-shaped curved wire is connected to the end ring; in a natural state, the umbrella-shaped curved wire is in a retracted state; when in use, the above-mentioned passive opening and closing single-tube net basket is passed into the umbrella sheath tube body, the net portion is passed to the umbrella-shaped curved wire, and the umbrella-shaped curved wire is unfolded when the net portion is opened.

[0012] Furthermore, the umbrella-shaped curved wire forms at least four consecutive umbrella-shaped pieces, the roots of the umbrella-shaped pieces are connected to the end rings, and the ends of the umbrella-shaped pieces are gradually narrowed, maintaining a gap between the adjacent umbrella-shaped pieces.

[0013] Furthermore, in the retracted state, the umbrella-shaped curved wire has a tapered structure as a whole, with an axial length of not less than 10 mm and a taper of 3 to 8 degrees.

[0014] Furthermore, the umbrella-shaped bending wire and the end ring are both made of stainless steel wire or nickel-titanium alloy wire, and a polymer film is further provided on the outer periphery of the umbrella-shaped bending wire.

[0015] A method for manufacturing a passive opening and closing umbrella sheath comprises the following steps: Take a metal wire, bend it into a continuous wave shape, weld the two ends of the wave-shaped metal wire together to form a circular wave, put the circular wave on an umbrella-shaped mold and bind it towards the middle to shape it, so as to obtain a tapered umbrella-shaped bent wire; An end ring is made, and the troughs of the umbrella-shaped bending wire are welded to the end ring in sequence; the end ring is connected to the end of the umbrella sheath tube body, and after welding, a film is coated on the umbrella-shaped bending wire and the end ring to obtain the passive opening and closing umbrella sheath.

[0016] In some embodiments, the passive opening and closing umbrella sheath can be manufactured in the following manner: Take a metal tube, cut a circular wavy umbrella-shaped curved wire at the end of the metal tube; cut the metal tube with the umbrella-shaped curved wire into a suitable length for use; A connecting groove is opened in the peripheral wall of the end of the umbrella sheath tube body, and a metal tube cut into a suitable length is inserted into the connecting groove. After being fixed, a film is coated on the umbrella-shaped bending wire and the metal tube to obtain the passive opening and closing umbrella sheath.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The passive opening and closing single-tube mesh basket can obtain a single-tube mesh basket structure by improving its structural form. When in use, it does not require the cooperation of an outer tube and can be used independently. It can also be used in conjunction with a tube mirror, a sheath tube, etc. to complete some object-taking operations; and the overall structure is simple, and the strength and flexibility are good; 2. The setting of the empty channel can not only be used to plug in instruments such as electrode wires and biopsy forceps, but also can be used in conjunction with the long core rod to allow the mesh to be retracted in the initial stage so that it can enter various cavities; 3. The mesh basket tube body itself is the memory alloy wire that forms the mesh part obtained by the flow of polymer materials, and has good integrity and flexibility. That is to say, the memory alloy wire that forms the mesh part in the passive opening and closing single-tube mesh basket is arranged in the tube wall of the mesh basket tube body, forming an integrated structure with it; 4. The long core rod is arranged along the mesh basket tube body The hollow channel of the body is inserted, and a certain external force can be applied to make the mesh part collapse. In this state, the entire single-tube mesh basket can be smoothly inserted into medical instruments such as endoscopic scopes and sheaths. After reaching the designated position, the long core rod is pulled out, and the mesh part automatically expands. The hollow channel can be used to insert instruments such as electrode wires, optical fibers or biopsy forceps, so as to perform surgical operations such as removing objects and stones in the lesion area of the human body; 5. The passive opening and closing umbrella sheath adopts a continuous wavy umbrella-shaped curved wire as the umbrella structure of the umbrella sheath, which can reduce the overall manufacturing difficulty and achieve the effect of passive opening and closing. The umbrella-shaped curved wire is in a collapsed state in the natural state so that the entire umbrella sheath can enter the human cavity, avoiding the scattered umbrella part from causing damage to the human cavity. When the end of the umbrella sheath tube body reaches the predetermined position, it can be opened under the action of the passive opening and closing single-tube mesh basket and used together with the mesh basket. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the expanded structure of a passive opening and closing single-tube basket of the present invention; Figure 2 This is a schematic diagram of the folding structure of a passive opening and closing single-tube basket of the present invention; Figure 3 Schematic diagram of the structure of the long core rod of the present invention; Figure 4 This is a schematic diagram of a passive opening and closing single-tube basket used in conjunction with different cavities of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of a passive opening and closing single-tube basket inserted into a tube mirror according to the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of a passive opening and closing single-tube basket inserted into a sheath tube according to the present invention; Figure 7 This is a schematic structural diagram of a passively opening and closing single-tube parachute sheath according to the present invention; Figure 8This is a front view of the end portion of a passively retractable single-tube parachute sheath according to the present invention; Figure 9 This is a top view of the end portion of a passively retractable single-tube parachute sheath according to the present invention; Figure 10 This is a schematic diagram of the structure of the umbrella-shaped curved wire laid out in the present invention; Figure 11 Schematic diagram of the manufacturing process of a passive opening and closing single-tube parachute sheath of the present invention Figure 1 ; Figure 12 Schematic diagram of the manufacturing process of a passive opening and closing single-tube parachute sheath of the present invention Figure 2 ; Figure 13 Schematic diagram of the manufacturing process of a passive opening and closing single-tube parachute sheath of the present invention Figure 3 ; In the figure: 1. basket tube body; 2. mesh part; 3. basket end; 4. memory alloy wire; 5. hollow channel; 6. long core rod; 7. end cap; 8. tube mirror; 9. sheath; 10. umbrella sheath tube body; 11. end ring; 12. umbrella-shaped bending wire; 13. first cutting path; 14. second cutting path; 15. connecting groove. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," etc., etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Example 1

[0021] On the one hand, if Figure 1-Figure 3As shown, a passive opening and closing single-tube basket is provided, comprising a basket body 1, a mesh portion 2 formed by a plurality of memory alloy wires 4 connected to the basket body 1, and a basket end 3 formed by converging one end of the plurality of memory alloy wires 4. The other ends of the plurality of memory alloy wires 4 extend and flow to form the basket body 1. The basket body 1 has an axial hollow channel 5; the hollow channel 5 is used to pass a removable medical device to reach or leave the area where the mesh portion is located. It also includes a long core rod 6, which is inserted and pulled into the hollow channel 5 and is used to support the basket end 3 to allow the net part 2 to be folded.

[0022] By improving its structural form, this passive opening and closing single-tube basket can obtain a single-tube basket structure that does not require the cooperation of an outer tube during use. It can be used independently or in conjunction with a tube mirror, sheath tube, etc. to perform some retrieval operations. In addition, the overall structure is simple and has good strength and flexibility.

[0023] The hollow channel 5 can not only be used to insert instruments such as electrode wires and biopsy forceps, but can also be used in conjunction with the long core rod 6 to allow the mesh to be retracted in the early stage so that it can enter various cavities.

[0024] The long core rod 6 is provided to passively retract the net portion of the single-tube basket by an external object. The net portion is opened by relying on the shape memorized by the memory alloy wire, but retraction requires the help of the long core rod.

[0025] The passive opening and closing single-tube mesh basket is not only significantly different from the mesh baskets in the prior art in structure, but also in the way of use. In terms of structure, the passive opening and closing single-tube mesh basket is provided with a hollow channel coaxial with itself, and does not need to be provided with an outer tube. The mesh basket tube body itself is formed by the memory alloy wire forming the mesh portion through the flow of polymer materials, and has good integrity and flexibility. That is to say, the memory alloy wire forming the mesh portion in the passive opening and closing single-tube mesh basket is arranged in the tube wall of the mesh basket tube body, forming an integrated structure therewith. Based on this The setting of this structure makes it different from the mesh basket in the prior art when in use. The mesh part is in an open shape in a natural state. Since there is no outer tube, the mesh part cannot be retracted by itself, making it inconvenient to enter medical devices such as tube mirrors and sheaths. Therefore, the long core rod is provided. The long core rod is inserted along the hollow channel of the mesh basket tube body. When the end of the long core rod abuts against the end of the mesh basket, a certain external force can be applied to retract the mesh part. In this state, the entire single-tube mesh basket can smoothly enter medical devices such as tube mirrors 8 and sheaths 9 (such as Figures 4-6As shown, after reaching the designated position, the long core rod is withdrawn, and the mesh portion automatically expands. The hollow channel allows for the insertion of instruments such as electrode wires, optical fibers, or biopsy forceps to facilitate surgical procedures such as removing objects or stones from lesions. The sheath described in this patent is not the outer tube of the basket and should be distinguished from the basket sheath in the prior art, as some literature also refers to the basket outer tube as a sheath.

[0026] The advantage of not having an outer tube is that the outer diameter of the entire basket can be reduced, and the size of the internal hollow channel can be increased, allowing it to enter various medical devices in small cavities, allowing other instruments to pass through it, and also capable of removing larger stones. Moreover, during subsequent adjustments, the outer tube of the basket is no longer required, and the basket tube itself can control the net.

[0027] The basket tube body 1 formed by the memory alloy wire 4 and the rheological flow of the polymer material can enhance its strength and flexibility, and also make it have better elasticity and adaptability compared to the metal wire set inside the basket tube body. It can adapt to different shapes on its own and can be bent at multiple angles without damage, so that it has better flexibility and can adapt to the tortuosity of the human body cavity; it also has better fatigue resistance and is not easy to damage the flexible tube body during long-term bending, so that the service life of the single-tube basket is increased.

[0028] Furthermore, the inner and outer walls of the basket tube 1 are provided with a super-slip coating, which facilitates the pushing and pulling of the basket tube 1 and the insertion of instruments such as electrode wires, laser fibers, and biopsy forceps.

[0029] It should be noted that the electrode wire is an electrode guide wire used for electrohydraulic lithotripsy, which is used to break up the stones trapped by the mesh. In this method, the basket tube can directly serve as a channel for the electrode guide wire to enter the human body, eliminating the need for additional cavities or devices. This allows for more targeted and accurate breaking of stones trapped by the mesh. The laser fiber is an optical fiber guide wire used for holmium laser lithotripsy and can similarly be deployed using this basket tube.

[0030] Furthermore, the basket end 3 is connected and fixed with a hydrophilic head or a 10-50mm loach head, which improves the head direction and passability of the entire single-tube basket, and enhances its integrity and non-damage. The basket end 3 is 1-4mm long and serves as the converging end of the multiple memory alloy wires 4, allowing the ends of these memory alloy wires to be fixedly connected together to form a stable and strong structure. The basket tube body ranges in length from tens of centimeters to several meters.

[0031] Furthermore, one end of the long core rod 6 is provided with an arc-shaped head, and the other end of the long core rod 6 is provided with a locking mechanism that is detachably connected to the basket tube body 1. When the locking mechanism is connected to the basket tube body 1, the head presses against the basket end head 3 and tightens and closes the net part 2 to a size not exceeding the outer diameter of the basket tube body 1.

[0032] The basket tube body 1 and the long core rod 6 are relatively long. If the locking mechanism is not provided at the ends of both, the long core rod will slide relative to the basket tube body, making it difficult to ensure the convergence of the net portion and the controllability of the basket tube body during the long-distance insertion of the single-tube basket. Therefore, the locking mechanism is provided. After the long core rod 6 is inserted into place and the net portion 2 is retracted, it can be locked with the end of the basket tube body 1, and the two will no longer slide relative to each other, thus facilitating the overall insertion and withdrawal. The provision of the plug facilitates passing through the hollow channel and supporting the end of the basket.

[0033] Furthermore, the locking mechanism is an end cap 7 arranged at the end of the long core rod 6, the opening of the end cap 7 is facing the length extension direction of the long core rod 6, the inner periphery of the opening of the end cap 7 is provided with an internal thread, and the outer periphery of the end of the basket tube body 1 is provided with an external thread that cooperates with the internal thread.

[0034] The end cap 7 can be a structure such as a nut. The cooperation of the internal thread and the external thread can conveniently connect the end of the long core rod 6 to the end of the basket tube body 1. It is also convenient to unlock it later to pull out the long core rod 6, leaving only the basket tube body in the cavity of the inserted endoscope or sheath.

[0035] On the other hand, this embodiment also provides a method for manufacturing a passive opening and closing single-tube basket, the method comprising the following steps: Taking a plurality of memory alloy wires, placing the front sections of the plurality of memory alloy wires in a mesh structure on a shaping die, and winding or braiding the middle and rear sections of the plurality of memory alloy wires in parallel on a core rod behind the shaping die, and obtaining the mesh portion and a mesh tube wound or braided with the memory alloy wires after shaping; The mesh tube wound or woven with memory alloy wires is subjected to polymer material heat flow transformation to form the tubular mesh basket body, and multiple memory alloy wires are left with 1 to 4 mm at the front end of the mesh basket mold as the mesh basket end, and a coaxial hydrophilic head or loach head is connected in front of the mesh basket end; An external thread is processed at the end of the basket tube body; a long core rod with an end cap is processed and manufactured according to the length of the basket tube body and the opening and closing size of the net part, and an internal thread matching the external thread is processed on the inner periphery of the end cap.

[0036] In this production method, after the mesh is formed, a longer portion of memory alloy wire is left behind. These excess memory alloy wires are directly formed into a mesh tube by winding, braiding, or straightening. The mesh tube is then heat-transformed into the tubular basket body through a polymer heat transfer process in a mold. This method not only forms a coaxial hollow channel but also allows the memory alloy wire to be contained within the tube wall, making it more resilient and stronger. This production method not only facilitates the production of this type of single-tube basket but also reduces memory alloy wire waste by eliminating the need to remove excess memory alloy wire from the mesh, saving material and lowering production costs.

[0037] The long core rod can be customized according to the length and inner diameter of the basket tube body. By separately providing the external thread and the internal thread, the two can be connected together during use. Example 2

[0038] This embodiment provides a passive opening and closing umbrella sheath, which can be used in conjunction with the passive opening and closing single-tube mesh basket in Example 1, and the umbrella sheath is opened by the passive opening and closing single-tube mesh basket.

[0039] Specifically, such as Figure 7-10 As shown, a passive opening and closing umbrella sheath includes an umbrella sheath tube body 10, with an end ring 11 provided at the end of the umbrella sheath tube body 10, and an umbrella-shaped bending wire 12 connected to the end ring 11; in a natural state, the umbrella-shaped bending wire 12 is in a retracted state; when in use, the above-mentioned passive opening and closing single-tube net basket is passed into the umbrella sheath tube body 10, the net portion 2 is passed to the umbrella-shaped bending wire 12, and the umbrella-shaped bending wire 12 is unfolded when the net portion 2 is opened.

[0040] During implementation, the passive opening and closing single-tube mesh basket extends from the end of the umbrella sheath tube body, so that the umbrella-shaped curved wire is opened, and the mesh portion automatically opens and catches the stone when it reaches the stone. The stone is appropriately moved so that it is within the range covered by the opened umbrella-shaped curved wire, and the stone is crushed using the electrode wire extending from the mesh basket tube body; in this process, the mesh portion holds the stone, which allows the electrode to crush the stone more accurately, and with the further protection of the umbrella-shaped curved wire, it can prevent the stone from scattering everywhere, ensure that the stone does not jump, and achieve a clean net; the umbrella-shaped curved wire can also form a protective umbrella to protect the human body cavity, preventing the stone from scratching the human body cavity.

[0041] The passive opening and closing umbrella sheath adopts a continuously undulating umbrella-shaped curved wire 12 as the umbrella structure of the umbrella sheath, which can reduce the overall manufacturing difficulty and also achieve the effect of passive opening and closing. The umbrella-shaped curved wire 12 is in a naturally retracted state so that the entire umbrella sheath can enter the human body cavity, avoiding damage to the human body cavity caused by the scattered umbrella part. When the end of the umbrella sheath tube body 10 reaches a predetermined position, it can be opened again under the action of the passive opening and closing single-tube net basket, forming a coordinated operation with the net basket.

[0042] Furthermore, the umbrella-shaped curved wire 12 forms at least four consecutive umbrella-shaped pieces, the roots of which are connected to the end ring 11 , and the ends of which gradually narrow, maintaining a gap with adjacent umbrella-shaped pieces.

[0043] Furthermore, in the retracted state, the umbrella-shaped curved wire 12 has an overall tapered structure, with an axial length of no less than 10 mm and a taper of 3 to 8 degrees. Preferably, the axial length is approximately 15 mm, the taper is approximately 5 degrees, the individual diameter of the umbrella-shaped curved wire 12 is 0.15 mm, and the outer diameter of the end ring 11 is approximately 4.35 mm and the inner diameter is approximately 0.42 mm.

[0044] Furthermore, the umbrella-shaped bending wire 12 and the end ring 11 are both made of stainless steel or nickel-titanium alloy wire, and a polymer film is provided on the outer periphery of the umbrella-shaped bending wire. The polymer film provides both restraining and resilient forces. After the mesh of the single-tube basket exits the umbrella-shaped region formed by the umbrella-shaped bending wire, the umbrella-shaped bending wire automatically closes to its initial state under the resilient force of the polymer film.

[0045] This embodiment further provides a method for manufacturing a passively opening and closing umbrella sheath, comprising the following steps: Take a metal wire, bend it into a continuous wave shape, weld the two ends of the wave-shaped metal wire together to form a circular wave, put the circular wave on an umbrella-shaped mold and bind it towards the middle to shape it, so as to obtain a tapered umbrella-shaped bent wire; An end ring is made, and the troughs of the umbrella-shaped bending wire are welded to the end ring in sequence; the end ring is connected to the end of the umbrella sheath tube body, and after welding, a film is coated on the umbrella-shaped bending wire and the end ring to obtain the passive opening and closing umbrella sheath.

[0046] The above-mentioned manufacturing method is to first make the umbrella-shaped bending wire and the end ring, weld the two into a whole, and then connect and fix them to the umbrella sheath tube body; in this process, the end ring can be welded to the metal wire inside the umbrella sheath tube body, or after coating, the polymer material can be welded to the polymer material on the umbrella sheath tube body.

[0047] In other embodiments, the passive opening and closing umbrella sheath may be manufactured in the following manner: Take a metal tube, cut a circular wavy umbrella-shaped curved wire at the end of the metal tube; cut the metal tube with the umbrella-shaped curved wire into a suitable length for use; A connecting groove is opened in the peripheral wall of the end of the umbrella sheath tube body, and a metal tube cut into a suitable length is inserted into the connecting groove. After the connection and fixation, a film is coated on the umbrella-shaped bending wire and the metal tube to obtain the passive opening and closing umbrella sheath.

[0048] In this embodiment, an umbrella-shaped curved wire with an end ring is formed by cutting. This production method is simpler and more feasible, and reduces the difficulty of welding. Because it is difficult to weld alloy wires of a few tenths of a millimeter, it is easier to produce by removing materials by cutting. Although it is simpler than welding, this cutting process also requires designing the cutting path and controlling the size, which is different from the existing cutting and forming method of the tube body.

[0049] Specifically, such as Figure 11 As shown, a wavy first cutting path 13 is designed at the end of the metal tube, and the end of the metal tube is cut into a wavy shape along the first cutting path 13; Figure 12 As shown, a second cutting path 14 is designed at the wavy end, which is similar to the aforementioned wavy cutting path but lower. There is also a circular cutting path below the cutting path. By cutting and removing the material there, a tube body with a wavy umbrella-shaped curved wire 12 can be obtained. The upper part can be cut according to the plug-in length to obtain an umbrella-shaped curved wire 12 with a plug-in base (end ring); as shown Figure 13 As shown, an annular connecting groove 15 is provided at the end of the umbrella sheath tube body 10 , and the umbrella-shaped bending wire 12 with a plug-in base (end ring) is connected thereto.

[0050] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A passive opening and closing single-tube basket, characterized in that: The device comprises a basket tube body, a mesh portion formed by a plurality of memory alloy wires connected to the basket tube body, and a basket end formed by converging one end of the plurality of memory alloy wires. The other ends of the plurality of memory alloy wires extend and flow to form the basket tube body. The basket tube body has an axial hollow passage; the hollow passage is used to pass a removable medical device to reach or leave the area where the mesh portion is located. It also includes a long core rod, which is arranged in the hollow channel in a push-pull manner and is used to support the end of the net basket to make the net part collapse.

2. The passive opening and closing single-tube basket according to claim 1, characterized in that: The inner wall of the basket tube body is provided with a super-slip coating.

3. The passive opening and closing single-tube basket according to claim 1, characterized in that: One end of the long core rod is provided with an arc-shaped head, and the other end of the long core rod is provided with a locking mechanism that is detachably connected to the basket tube body. When the locking mechanism is connected to the basket tube body, the head presses against the end of the basket and tightens and closes the net to a size that does not exceed the outer diameter of the basket tube body.

4. The passive opening and closing single-tube basket according to claim 3, characterized in that: The locking mechanism is an end cap arranged at the end of the long core rod, the opening of the end cap is facing the length extension direction of the long core rod, the inner periphery of the opening of the end cap is provided with an internal thread, and the outer periphery of the end of the basket tube body is provided with an external thread that cooperates with the internal thread.

5. A method for manufacturing a passive opening and closing single-tube basket according to any one of claims 1 to 4, characterized in that: The production method comprises the following steps: Taking a plurality of memory alloy wires, placing the front sections of the plurality of memory alloy wires in a mesh structure on a shaping die, and winding or braiding the middle and rear sections of the plurality of memory alloy wires in parallel on a core rod behind the shaping die, and obtaining the mesh portion and a mesh tube wound or braided with the memory alloy wires after shaping; The mesh tube wound or woven with memory alloy wires is subjected to polymer material thermal transformation to form the tubular basket body, and multiple memory alloy wires are left with 1 to 4 mm at the front end of the basket mold as a basket end, and a coaxial hydrophilic head or loach head is connected in front of the basket end; An external thread is processed at the end of the basket tube body; a long core rod with an end cap is processed and manufactured according to the length of the basket tube body and the opening and closing size of the net part, and an internal thread matching the external thread is processed on the inner periphery of the end cap.

6. A passive opening and closing umbrella sheath, characterized in that: It comprises an umbrella sheath tube body, the end of which is provided with an end ring, and the end ring is connected to an umbrella-shaped curved wire; in a natural state, the umbrella-shaped curved wire is in a retracted state; when in use, the passive opening and closing single-tube net basket according to any one of claims 1 to 4 is passed into the umbrella sheath tube body, the net portion is passed to the umbrella-shaped curved wire, and the umbrella-shaped curved wire is unfolded when the net portion is opened.

7. The passive opening and closing umbrella sheath according to claim 6, characterized in that: The umbrella-shaped curved wire forms at least four consecutive umbrella-shaped pieces, the roots of which are connected to the end rings, and the ends of which are gradually narrowed, maintaining a gap between adjacent umbrella-shaped pieces.

8. The passive opening and closing umbrella sheath according to claim 6, characterized in that: In the retracted state, the umbrella-shaped curved wire has a tapered structure as a whole, with an axial length of not less than 10 mm and a taper of 3 to 8 degrees.

9. The passive opening and closing umbrella sheath according to claim 6, characterized in that: The materials of the umbrella-shaped bending wire and the end ring are both stainless steel wire or nickel-titanium alloy wire, and a polymer film is further provided on the outer periphery of the umbrella-shaped bending wire.

10. A method for manufacturing a passive opening and closing umbrella sheath according to claim 6, characterized in that: The steps include: Take a metal wire, bend it into a continuous wave shape, weld the two ends of the wave-shaped metal wire together to form a circular wave, put the circular wave on an umbrella-shaped mold and bind it towards the middle to shape it, so as to obtain a tapered umbrella-shaped bent wire; An end ring is made, and the troughs of the umbrella-shaped bending wire are welded to the end ring in sequence; the end ring is connected to the end of the umbrella sheath tube body, and after welding, a film is coated on the umbrella-shaped bending wire and the end ring to obtain the passive opening and closing umbrella sheath.

11. A method for manufacturing a passive opening and closing umbrella sheath according to claim 6, characterized in that: The steps include: Take a metal tube, cut a circular wavy umbrella-shaped curved wire at the end of the metal tube; cut the metal tube with the umbrella-shaped curved wire into a suitable length for use; A connecting groove is opened in the peripheral wall of the end of the umbrella sheath tube body, and a metal tube cut into a suitable length is inserted into the connecting groove. After being fixed, a film is coated on the umbrella-shaped bending wire and the metal tube to obtain the passive opening and closing umbrella sheath.

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